Bulldozer



March 1942- G. R. MCINTVOSH 2,276,58

BULLDOZER Filed April 27, 1940 2 4 INVENTOR.

Geo/:76 RM? lnfosh ATTORNEY.

Patented Mar. 17, 1942 UNITED STATES FFECE Q TET 1 Claim.

My invention relates to improvements in that class of machines known inthe trade as bulldozers, and the principal object is to providesubstantial means for moving dirt and scraping roads and the like, whichmay be quickly and easily assembled and disassembled for shipping orhauling.

The invention also comprises novel details of construction and novelcombinations and arrangements of parts, which will more fully appear inthe course of the following description. However, the drawing merelyshows and the following description merely describes an embodiment ofthe present invention, which is given by way of illustration or exampleonly.

In the drawing, like reference characters designate similar parts in theseveral views.

Figure 1 is a plan view of an embodiment of my invention applied to atractor (the tractor is suggested by broken lines).

Figure 2 is a section taken on the line 22 of Figure 1, looking in thedirection of the arrows.

Figure 3 is an enlarged section taken on the line 3-3 of Figure 1.

Referring more in detail to the drawing, the reference numeral 4generally designates a tractor provided with tracks 5 and B. Side frames1 of the tractor carry plates 8 upon which are mounted trunnions 9.Detailed description and drawings of the tractor are deemed unnecessary,since its construction is well known to those skilled in the art.

The present invention comprises a scraper blade support II! that isrearwardly inclined with respect to the direction of travel and isbraced in such position by a brace l2. A base [3 spans the space betweenthe support In and the brace l2 and completes a pyramidal construction(as shown in Figure 2) that is a strong arrangement of parts. Gussetplates l4 support the base l3 and strengthen the blade support [0.

The support I0 is apertured, as shown at I 5, for fasteninginterchangeable and removable cutting blades (not shown) thereto. Plates[6 behind the support In afford additional strength and are apertured,as shown at IT, for fastening end scraper plates (not shown).

An angular, hollow beam l8 extends along the top of a moldboard [9 abovethe scraper blade support It and between end plates 20. The end platesaid in providing a pocket at the front of the scraper for holding dirt.

Extending rearward of the scraping mechanism just described, at oppositesides thereof, are

female box sections 2| and 22. The inner ends of said box sections arewelded to the rear of the pyramidal base hereinbefore described. Theouter, open ends of the female sections receive the ends of male beams23 and 24 respectively. Abutment plates 40 are arranged in the femalesections 2|, 22, near the inner ends thereof, for end abutment of themale sections 23, 24 therewith. Anchors 4| behind the abutment platesreenforce the abutment plates in their positions. Bearings 25, at theouter ends of the male beams, pivot the scraper mechanism about thetrunnions 9.

Vertical braces 23 extend from the hollow beam 18 down to brace thefemale box sections at the upper side thereof. Horizontal braces 21extend from the pyramidal construction [2 to the sides of the female boxsections. Bands 28 around the ends of the female box sections strengthensuch open ends.

Tapped blocks 29 welded on the female box sections 22 provide bearingsfor cap screws 30. Lock nuts 3| tend to maintain the cap screws inposition. The male beam sections 23 and 24 have correspondingly shapedrecesses to receive pointed tips 32 of the cap screws.

A yoke 33 upstanding on the front end of the tractor carries a sheave 34over which passes a cable 35. The forward end of the cabl is loopedaround a bar-36 mounted on plates 37 that are fastened to the hollowbeam l8. Said end of the cable is bolted to itself, as shown at 39. Theopposite end of the cable is connected to a suitable winch (not-shown)on the tractor, so that the blade unit may be raised and lowered at willaround the trunnions 9 as pivots. To prepare the present device for use,an interchangeable scraper blade or blades are bolted to the blade vsupport H] by means of the apertures l5. Separate plates may be used atthe ends, where the greatest wear occurs.

For shipping purposes, the present device may be easily and quicklydismantled, by unscrewing the cap screws 30 and separating thetelescoping sections 22, 24. At its destination the device may be easilyreassembled and mounted on a.

It will be noticed from Figure 1' that the text scoping members 23, 24flare outwardly from the pivotal connections with thetractor, and thatthe telescoping members 2|, 22, therefore, have angular arrangementswith the blade support, other than a right angular arrangement. Thebraces 26, 21 tend to maintain the telescoping members and the bladesupport in such arrangement.

While I have illustrated and described what I now regard as thepreferred embodiment of my invention, the construction is, of course,subject to modifications without departing from the spirit and scope ofmy invention. 1, therefore, do not wish to restrict myself to theparticular form of construction illustrated and described, but desire toavail myself of all modifications which may fall within the scope of theappended claim.

Having thus described my invention, What I claim and desire to secure byLetters Patent is:

In a tractor-attached bulldozer of the type including a blade supportforwardly and transversely of the tractor, and side beams pivotallyconnected at their rear portions to the tractor sides and having attheir forward portions vertically and horizontally inclined bracemembers connecting the same with the transverse blade support, forming arigid U-shaped vertically swingable bulldozer frame, the improvementwhich consists in forming the side beams in for- Ward and rear sections,the forward sections being in the form of tubes rigidly secured at theirforward ends to the blade support and of a length to receive the rear,outer ends of the said brace members, and the rear sections beingpivoted at their rear ends to the tractor and having their forwardportions telescoping within the forward sections; the said forwardsections having an internal abutment plate in each forward section toreceive the forward end of the rear section thereagainst, an anchoringmember behind each abutment plate to reinforce the abutment plate in itsposition, and means to rigidly clamp the telescoping portions of thesections together when the rear sections are so engaged with theabutments.

GEORGE R. MCINTOSH.

